I didn't know what you meant so I googled it. The technology is cool, but the content is ... problematic.

From urban dictionary:

   "Waifu" is used to refer to a fictional girl or woman (usually in Anime, Manga, or video-games) that you have sexual attraction to, and you would even marry.

Huh.

A big part of it you're missing is that it's a joke. Anime fans definitely know they're weird, and are very passionate about the things they like (and are conscious of that), and thus a lot of humor in the community is self-deprecating and ironic (for example, calling your favorite fictional character your "waifu" or "husbando"). The fact that outside observers might think it's "problematic" is kind of the whole point.

youd be surprised at the waifu market size